Albert Barnes Commentary Jeremiah 44:1

"The word that came to Jeremiah concerning all the Jews that dwelt in the land of Egypt, that dwelt at Migdol, and at Tahpanhes, and at Memphis, and in the country of Pathros, saying," — Jeremiah 44:1 (ASV)

Migdol - Magdolum, a strong fortress on the northern boundary of Egypt.